Perhaps one needs to be a Historian to figure out what space is.
I have a copy of a book that was printed in 1927, this book is a copy of another book, that book was translated from another language, that translation was made in 1861. The said book has been in our family for a long time, in fact I believe that the book was given to my parents as a wedding present. When I was young it was impressed on me that the book had very important information in it. It was also explained that much of the information was encoded in such a way that it was impossible for most people to understand it. Being curious I started reading the book and found out that I understood the words but did not understand the total meaning of the sentences. It was like being lost in a forest, standing there among the trees, not knowing how large the forest was or where about you were within there. Not until I started to understand Einstein’s general theory of relativity did I begin to understand the encoding of the words in the book.
By combining the information that I gathered from the said book and many other sources, I have generated the following postulations.
1) The meaning of the word SPACE in its ‘fundamental essence’ is; an area that contains nothing. That is; no mass, no photons, no electromagnetic fields of any kind. Such a ‘space’ is unstable; it acts as if it was a super powerful vacuum drawing its surroundings towards its center. Such a FORCE can be considered as a POTENTIAL for kinetic energy. I’ll use the letter U to represent such a fundamental “space force” or ‘potential energy’.
2) The meaning of the word ENERGY in its ‘fundamental essence’ is; motion. Anything that moves in anyway at all has ‘energy’ or more precisely ‘kinetic energy’. I’ll use the letter E to represent this ‘fundamental motion’ or energy.
3) The meaning of the word MASS in its ‘fundamental essence’ is; that which manifests itself as density. The density of such mass can vary from almost zero to extremely high or ‘solid’. Any ‘solid mass ‘ is unstable it will explode and in the process it becomes less dense. I’ll use the letter K to represent this ‘fundamental mass’.
4) The words; zero, constant, and firmament have the meaning; ‘reference point’. The reference point for calculating fundamental forces is the ‘constant’ or C that Einstein used in his calculations.
5) According to Einstein E=MC2 According to my old book E=(U/K)C. The numeric results are the same for both calculations.
Using the above reasoning I’ll try to answer Historians questions.
H--It is pretty much accepted now that space is not independent of matter, but is created when matter is created.
Me—Space and matter coexist but we cannot create or destroy ether.
H--It appears that space is created, then, by energy in motion (kinetic energy). If that is true, then electromagnetic waves are simply an indication of space being created.
Me—Space is only displaced not created

H--The mechanics of, say, a high-powered laser beam must somehow involve interaction between virtual paired photons, one in this universe, and one in a hidden dimension that is not subject to space or time. This would fit with Bell's Theorem. So, the speed of light can be explained by saying that light creates its own space and should, thus, travel infinitely fast in that hidden dimension. The interaction between those virtual photons must somehow be the cause of light slowing down from infinite speed to that which we know.
Me—The less obstructions in the way the faster mass or light can move. The ‘speed of light’ that has been measured is the result of restricted acceleration of photons by the space/time continuum.
H--Therefore, the speed of light is a clue which should be investigated more thoroughly, because it hints of some new parameter or curvature or whatever that might someday allow better insight into "what came before".
Me--Investigation of natural phenomenon is always useful.
H--Following along this line of reasoning, it would seem that two black holes are completely independent of each other, and do not "connect" in some other universe. That is, what is observed about the gravitational effects of black holes is only a relationship between this universe and ... and ... nothing at all!
Me--Depends on what you consider as a ‘black hole’. Holes are usually empty.
H--Pursuing this still further, we see that completely separate universes could pop up anywhere, with no connection among them, ever.
H--So, try this thought problem for size: Go out into completely empty space somewhere and focus a large number of high powered lasers so that they meet at a point, with the emphasis being that their combined efforts cannot allow anything to escape from that point.
What would happen?
Me—Perhaps the photons would fuse together and create higher density ‘particles’.